Sección R503 — ENTABLADO DE PISO
2025 California Residential Code (Title 24, Part 2.5) · edición 2025 · actualizado 2026-07-07 · California
R503.1 Revestimiento de madera. ¶
| TABLA R503.1—ESPESOR MÍNIMO DEL REVESTIMIENTO DE MADERA PARA PISOS | Col2 | Col3 |
|---|---|---|
| ESPACIADO DE VIGAS O TRAVESAÑOS (pulgadas) |
ESPESOR NETO MÍNIMO | ESPESOR NETO MÍNIMO |
| ESPACIADO DE VIGAS O TRAVESAÑOS (pulgadas) |
Perpendicular a la viga | Diagonal a la viga |
| 24 | 11/16 | 3/4 |
| 16 | 5/8 | 5/8 |
| 48a | 11/2 T & G | N/A |
| 54b | 54b | 54b |
| 60c | 60c | 60c |
| Para SI: 1 pulgada = 25.4 mm, 1 libra por pulgada cuadrada = 6.895 kPa. N/A = No Aplicable. a. Para este espaciamiento de soporte, el revestimiento de madera deberá tener un Fb mínimo de 675 y un E mínimo de 1,100,000 (ver ANSI AWC NDS). b. Para este espaciamiento de soporte, el revestimiento de madera deberá tener un Fb mínimo de 765 y un E mínimo de 1,400,000 (ver ANSI AWC NDS). c. Para este espaciamiento de soporte, el revestimiento de madera deberá tener un Fb mínimo de 855 y un E mínimo de 1,700,000 (ver ANSI AWC NDS). |
Para SI: 1 pulgada = 25.4 mm, 1 libra por pulgada cuadrada = 6.895 kPa. N/A = No Aplicable. a. Para este espaciamiento de soporte, el revestimiento de madera deberá tener un Fb mínimo de 675 y un E mínimo de 1,100,000 (ver ANSI AWC NDS). b. Para este espaciamiento de soporte, el revestimiento de madera deberá tener un Fb mínimo de 765 y un E mínimo de 1,400,000 (ver ANSI AWC NDS). c. Para este espaciamiento de soporte, el revestimiento de madera deberá tener un Fb mínimo de 855 y un E mínimo de 1,700,000 (ver ANSI AWC NDS). |
Para SI: 1 pulgada = 25.4 mm, 1 libra por pulgada cuadrada = 6.895 kPa. N/A = No Aplicable. a. Para este espaciamiento de soporte, el revestimiento de madera deberá tener un Fb mínimo de 675 y un E mínimo de 1,100,000 (ver ANSI AWC NDS). b. Para este espaciamiento de soporte, el revestimiento de madera deberá tener un Fb mínimo de 765 y un E mínimo de 1,400,000 (ver ANSI AWC NDS). c. Para este espaciamiento de soporte, el revestimiento de madera deberá tener un Fb mínimo de 855 y un E mínimo de 1,700,000 (ver ANSI AWC NDS). |
R503.1.1 Juntas finales. Las juntas finales en la madera utilizada como subpiso deberán ubicarse sobre los soportes, a menos que se utilice madera con juntas finales machihembradas, en cuyo caso cada pieza deberá apoyarse en no menos de dos vigas. Se permitirá omitir el subpiso cuando el espaciamiento de las vigas no exceda de 16 pulgadas (406 mm) y se aplique un piso de listones de madera nominal de 1 pulgada (25 mm) con machihembrado perpendicular a las vigas.
R503.2 Revestimiento con paneles estructurales de madera. ¶
R503.2 Revestimiento de paneles estructurales de madera.
R503.2.1 Identificación y grado. El revestimiento de paneles estructurales de madera utilizado con fines estructurales deberá cumplir con CSA O325, CSA O437 DOC PS 1 o DOC PS 2. Los paneles deberán estar identificados por grado, clasificación de adhesivo y Categoría de Rendimiento mediante una marca de grado o un certificado de inspección emitido por una agencia aprobada. El valor de la Categoría de Rendimiento se utilizará como el “espesor nominal del panel” o “espesor del panel” dondequiera que se haga referencia en este código.
R503.2.1.1 Subsuelo y combinación de subsuelo con capa base. Cuando se utilicen como subsuelo o combinación de subsuelo con capa base, los paneles estructurales de madera deberán ser de uno de los grados especificados en la Tabla R503.2.1.1(1). Cuando se utilice madera contrachapada lijada como combinación de subsuelo con capa base, el grado, la clasificación de adhesivo y la Categoría de Rendimiento deberán ser los especificados en la Tabla R503.2.1.1(2).
5-12 2025 CÓDIGO RESIDENCIAL DE CALIFORNIA
el 18 de julio de 2025 11:14 AM (CDT) BAJO ELLO.
PISOS
| TABLE R503.2.1.1(1)—ALLOWABLE SPANS AND LOADS FOR WOOD STRUCTURAL PANELS FOR ROOF AND SUBFLOOR SHEATHING AND COMBINATION SUBFLOOR UNDERLAYMENTa, b, c |
Col2 | Col3 | Col4 | Col5 | Col6 | Col7 | Col8 | Col9 |
|---|---|---|---|---|---|---|---|---|
| SPAN RATING |
MINIMUM NOMINAL PANEL THICKNESS (inch) |
ALLOWABLE LIVE LOAD (psf)h, I |
ALLOWABLE LIVE LOAD (psf)h, I |
MAXIMUM SPAN (inches) |
MAXIMUM SPAN (inches) |
LOAD (pounds per square foot, at maximum span) |
LOAD (pounds per square foot, at maximum span) |
MAXIMUM SPAN (inches) |
| SPAN RATING |
MINIMUM NOMINAL PANEL THICKNESS (inch) |
Span @ 16″ o.c. |
Span @ 24″ o.c. |
With edge supportd |
Without edge support |
Total load | Live load | Live load |
| Sheathinge | Sheathinge | Rooff | Rooff | Rooff | Rooff | Subfloorj | ||
| 16/0 | 3/8 | 30 | — | 16 | 16 | 40 | 30 | 0 |
| 20/0 | 3/8 | 50 | — | 20 | 20 | 40 | 30 | 0 |
| 24/0 | 3/8 | 100 | 30 | 24 | 20g | 40 | 30 | 0 |
| 24/16 | 7/16 | 100 | 40 | 24 | 24 | 50 | 40 | 16 |
| 32/16 | 15/32, 1/2 | 180 | 70 | 32 | 28 | 40 | 30 | 16h |
| 40/20 | 19/32, 5/8 | 305 | 130 | 40 | 32 | 40 | 30 | 20h, i |
| 48/24 | 23/32, 3/4 | — | 175 | 48 | 36 | 45 | 35 | 24 |
| 60/32 | 7/8 | — | 305 | 60 | 48 | 45 | 35 | 32 |
| Underlayment, C-C plugged, single floore |
Underlayment, C-C plugged, single floore |
Rooff | Rooff | Rooff | Rooff | Combination subfloor underlaymentk |
||
| 16 o.c. | 19/32, 5/8 | 100 | 40 | 24 | 24 | 50 | 40 | 16i |
| 20 o.c. | 19/32, 5/8 | 150 | 60 | 32 | 32 | 40 | 30 | 20i, j |
| 24 o.c. | 23/32, 3/4 | 240 | 100 | 48 | 36 | 35 | 25 | 24 |
| 32 o.c. | 7/8 | — | 185 | 48 | 40 | 50 | 40 | 32 |
| 48 o.c. | 13/32, 11/8 | — | 290 | 60 | 48 | 50 | 40 | 48 |
| For SI: 1 inch = 25.4 mm, 1 pound per square foot = 0.0479 kPa. a. The allowable total loads were determined using a dead load of 10 psf. If the dead load exceeds 10 psf, then the live load shall be reduced accordingly. b. Panels continuous over two or more spans with long dimension (strength axis) perpendicular to supports. Spans shall be limited to values shown because of possible effect of concentrated loads. c. Applies to panels 24 inches or wider. d. Lumber blocking, panel edge clips (one midway between each support, except two equally spaced between supports where span is 48 inches), tongue-and-groove panel edges, or other approved type of edge support. e. Includes Structural I panels in these grades. f. Uniform load deflection limitation:1/180 of span under live load plus dead load,1/240 of span under live load only. g. Maximum span 24 inches for15/32- and1/2-inch panels. h. Maximum span 24 inches where3/4-inch wood finish flooring is installed at right angles to joists. i. Maximum span 24 inches where 1.5 inches of lightweight concrete or approved cellular concrete is placed over the subfloor. j. Unsupported edges shall have tongue-and-groove joints or shall be supported with blocking unless minimum nominal1/4-inch-thick wood panel-type underlayment, fiber- cement underlayment with end and edge joints offset not less than 2 inches or 11/2 inches of lightweight concrete or approved cellular concrete is placed over the subfloor, or 3/4-inch wood finish flooring is installed at right angles to the supports. Fiber-cement underlayment shall comply with ASTM C1288 or ISO 8336 Category C. Allowable uniform live load at maximum span, based on deflection of1/360 of span, is 100 psf. k. Unsupported edges shall have tongue-and-groove joints or shall be supported by blocking unless nominal1/4-inch-thick wood panel-type underlayment, fiber-cement under- layment with end and edge joints offset not less than 2 inches or3/4-inch wood finish flooring is installed at right angles to the supports. Fiber-cement underlayment shall comply with ASTM C1288 or ISO 8336 Category C. Allowable uniform live load at maximum span, based on deflection of1/360 of span, is 100 psf, except panels with a span rating of 48 on center are limited to 65 psf total uniform load at maximum span. l. Allowable live load values at spans of 16 inches on center and 24 inches on center taken from referenced standard APA E30,APA Engineered Wood Construction Guide. Refer to referenced standard for allowable spans not listed in the table. |
For SI: 1 inch = 25.4 mm, 1 pound per square foot = 0.0479 kPa. a. The allowable total loads were determined using a dead load of 10 psf. If the dead load exceeds 10 psf, then the live load shall be reduced accordingly. b. Panels continuous over two or more spans with long dimension (strength axis) perpendicular to supports. Spans shall be limited to values shown because of possible effect of concentrated loads. c. Applies to panels 24 inches or wider. d. Lumber blocking, panel edge clips (one midway between each support, except two equally spaced between supports where span is 48 inches), tongue-and-groove panel edges, or other approved type of edge support. e. Includes Structural I panels in these grades. f. Uniform load deflection limitation:1/180 of span under live load plus dead load,1/240 of span under live load only. g. Maximum span 24 inches for15/32- and1/2-inch panels. h. Maximum span 24 inches where3/4-inch wood finish flooring is installed at right angles to joists. i. Maximum span 24 inches where 1.5 inches of lightweight concrete or approved cellular concrete is placed over the subfloor. j. Unsupported edges shall have tongue-and-groove joints or shall be supported with blocking unless minimum nominal1/4-inch-thick wood panel-type underlayment, fiber- cement underlayment with end and edge joints offset not less than 2 inches or 11/2 inches of lightweight concrete or approved cellular concrete is placed over the subfloor, or 3/4-inch wood finish flooring is installed at right angles to the supports. Fiber-cement underlayment shall comply with ASTM C1288 or ISO 8336 Category C. Allowable uniform live load at maximum span, based on deflection of1/360 of span, is 100 psf. k. Unsupported edges shall have tongue-and-groove joints or shall be supported by blocking unless nominal1/4-inch-thick wood panel-type underlayment, fiber-cement under- layment with end and edge joints offset not less than 2 inches or3/4-inch wood finish flooring is installed at right angles to the supports. Fiber-cement underlayment shall comply with ASTM C1288 or ISO 8336 Category C. Allowable uniform live load at maximum span, based on deflection of1/360 of span, is 100 psf, except panels with a span rating of 48 on center are limited to 65 psf total uniform load at maximum span. l. Allowable live load values at spans of 16 inches on center and 24 inches on center taken from referenced standard APA E30,APA Engineered Wood Construction Guide. Refer to referenced standard for allowable spans not listed in the table. |
For SI: 1 inch = 25.4 mm, 1 pound per square foot = 0.0479 kPa. a. The allowable total loads were determined using a dead load of 10 psf. If the dead load exceeds 10 psf, then the live load shall be reduced accordingly. b. Panels continuous over two or more spans with long dimension (strength axis) perpendicular to supports. Spans shall be limited to values shown because of possible effect of concentrated loads. c. Applies to panels 24 inches or wider. d. Lumber blocking, panel edge clips (one midway between each support, except two equally spaced between supports where span is 48 inches), tongue-and-groove panel edges, or other approved type of edge support. e. Includes Structural I panels in these grades. f. Uniform load deflection limitation:1/180 of span under live load plus dead load,1/240 of span under live load only. g. Maximum span 24 inches for15/32- and1/2-inch panels. h. Maximum span 24 inches where3/4-inch wood finish flooring is installed at right angles to joists. i. Maximum span 24 inches where 1.5 inches of lightweight concrete or approved cellular concrete is placed over the subfloor. j. Unsupported edges shall have tongue-and-groove joints or shall be supported with blocking unless minimum nominal1/4-inch-thick wood panel-type underlayment, fiber- cement underlayment with end and edge joints offset not less than 2 inches or 11/2 inches of lightweight concrete or approved cellular concrete is placed over the subfloor, or 3/4-inch wood finish flooring is installed at right angles to the supports. Fiber-cement underlayment shall comply with ASTM C1288 or ISO 8336 Category C. Allowable uniform live load at maximum span, based on deflection of1/360 of span, is 100 psf. k. Unsupported edges shall have tongue-and-groove joints or shall be supported by blocking unless nominal1/4-inch-thick wood panel-type underlayment, fiber-cement under- layment with end and edge joints offset not less than 2 inches or3/4-inch wood finish flooring is installed at right angles to the supports. Fiber-cement underlayment shall comply with ASTM C1288 or ISO 8336 Category C. Allowable uniform live load at maximum span, based on deflection of1/360 of span, is 100 psf, except panels with a span rating of 48 on center are limited to 65 psf total uniform load at maximum span. l. Allowable live load values at spans of 16 inches on center and 24 inches on center taken from referenced standard APA E30,APA Engineered Wood Construction Guide. Refer to referenced standard for allowable spans not listed in the table. |
For SI: 1 inch = 25.4 mm, 1 pound per square foot = 0.0479 kPa. a. The allowable total loads were determined using a dead load of 10 psf. If the dead load exceeds 10 psf, then the live load shall be reduced accordingly. b. Panels continuous over two or more spans with long dimension (strength axis) perpendicular to supports. Spans shall be limited to values shown because of possible effect of concentrated loads. c. Applies to panels 24 inches or wider. d. Lumber blocking, panel edge clips (one midway between each support, except two equally spaced between supports where span is 48 inches), tongue-and-groove panel edges, or other approved type of edge support. e. Includes Structural I panels in these grades. f. Uniform load deflection limitation:1/180 of span under live load plus dead load,1/240 of span under live load only. g. Maximum span 24 inches for15/32- and1/2-inch panels. h. Maximum span 24 inches where3/4-inch wood finish flooring is installed at right angles to joists. i. Maximum span 24 inches where 1.5 inches of lightweight concrete or approved cellular concrete is placed over the subfloor. j. Unsupported edges shall have tongue-and-groove joints or shall be supported with blocking unless minimum nominal1/4-inch-thick wood panel-type underlayment, fiber- cement underlayment with end and edge joints offset not less than 2 inches or 11/2 inches of lightweight concrete or approved cellular concrete is placed over the subfloor, or 3/4-inch wood finish flooring is installed at right angles to the supports. Fiber-cement underlayment shall comply with ASTM C1288 or ISO 8336 Category C. Allowable uniform live load at maximum span, based on deflection of1/360 of span, is 100 psf. k. Unsupported edges shall have tongue-and-groove joints or shall be supported by blocking unless nominal1/4-inch-thick wood panel-type underlayment, fiber-cement under- layment with end and edge joints offset not less than 2 inches or3/4-inch wood finish flooring is installed at right angles to the supports. Fiber-cement underlayment shall comply with ASTM C1288 or ISO 8336 Category C. Allowable uniform live load at maximum span, based on deflection of1/360 of span, is 100 psf, except panels with a span rating of 48 on center are limited to 65 psf total uniform load at maximum span. l. Allowable live load values at spans of 16 inches on center and 24 inches on center taken from referenced standard APA E30,APA Engineered Wood Construction Guide. Refer to referenced standard for allowable spans not listed in the table. |
For SI: 1 inch = 25.4 mm, 1 pound per square foot = 0.0479 kPa. a. The allowable total loads were determined using a dead load of 10 psf. If the dead load exceeds 10 psf, then the live load shall be reduced accordingly. b. Panels continuous over two or more spans with long dimension (strength axis) perpendicular to supports. Spans shall be limited to values shown because of possible effect of concentrated loads. c. Applies to panels 24 inches or wider. d. Lumber blocking, panel edge clips (one midway between each support, except two equally spaced between supports where span is 48 inches), tongue-and-groove panel edges, or other approved type of edge support. e. Includes Structural I panels in these grades. f. Uniform load deflection limitation:1/180 of span under live load plus dead load,1/240 of span under live load only. g. Maximum span 24 inches for15/32- and1/2-inch panels. h. Maximum span 24 inches where3/4-inch wood finish flooring is installed at right angles to joists. i. Maximum span 24 inches where 1.5 inches of lightweight concrete or approved cellular concrete is placed over the subfloor. j. Unsupported edges shall have tongue-and-groove joints or shall be supported with blocking unless minimum nominal1/4-inch-thick wood panel-type underlayment, fiber- cement underlayment with end and edge joints offset not less than 2 inches or 11/2 inches of lightweight concrete or approved cellular concrete is placed over the subfloor, or 3/4-inch wood finish flooring is installed at right angles to the supports. Fiber-cement underlayment shall comply with ASTM C1288 or ISO 8336 Category C. Allowable uniform live load at maximum span, based on deflection of1/360 of span, is 100 psf. k. Unsupported edges shall have tongue-and-groove joints or shall be supported by blocking unless nominal1/4-inch-thick wood panel-type underlayment, fiber-cement under- layment with end and edge joints offset not less than 2 inches or3/4-inch wood finish flooring is installed at right angles to the supports. Fiber-cement underlayment shall comply with ASTM C1288 or ISO 8336 Category C. Allowable uniform live load at maximum span, based on deflection of1/360 of span, is 100 psf, except panels with a span rating of 48 on center are limited to 65 psf total uniform load at maximum span. l. Allowable live load values at spans of 16 inches on center and 24 inches on center taken from referenced standard APA E30,APA Engineered Wood Construction Guide. Refer to referenced standard for allowable spans not listed in the table. |
For SI: 1 inch = 25.4 mm, 1 pound per square foot = 0.0479 kPa. a. The allowable total loads were determined using a dead load of 10 psf. If the dead load exceeds 10 psf, then the live load shall be reduced accordingly. b. Panels continuous over two or more spans with long dimension (strength axis) perpendicular to supports. Spans shall be limited to values shown because of possible effect of concentrated loads. c. Applies to panels 24 inches or wider. d. Lumber blocking, panel edge clips (one midway between each support, except two equally spaced between supports where span is 48 inches), tongue-and-groove panel edges, or other approved type of edge support. e. Includes Structural I panels in these grades. f. Uniform load deflection limitation:1/180 of span under live load plus dead load,1/240 of span under live load only. g. Maximum span 24 inches for15/32- and1/2-inch panels. h. Maximum span 24 inches where3/4-inch wood finish flooring is installed at right angles to joists. i. Maximum span 24 inches where 1.5 inches of lightweight concrete or approved cellular concrete is placed over the subfloor. j. Unsupported edges shall have tongue-and-groove joints or shall be supported with blocking unless minimum nominal1/4-inch-thick wood panel-type underlayment, fiber- cement underlayment with end and edge joints offset not less than 2 inches or 11/2 inches of lightweight concrete or approved cellular concrete is placed over the subfloor, or 3/4-inch wood finish flooring is installed at right angles to the supports. Fiber-cement underlayment shall comply with ASTM C1288 or ISO 8336 Category C. Allowable uniform live load at maximum span, based on deflection of1/360 of span, is 100 psf. k. Unsupported edges shall have tongue-and-groove joints or shall be supported by blocking unless nominal1/4-inch-thick wood panel-type underlayment, fiber-cement under- layment with end and edge joints offset not less than 2 inches or3/4-inch wood finish flooring is installed at right angles to the supports. Fiber-cement underlayment shall comply with ASTM C1288 or ISO 8336 Category C. Allowable uniform live load at maximum span, based on deflection of1/360 of span, is 100 psf, except panels with a span rating of 48 on center are limited to 65 psf total uniform load at maximum span. l. Allowable live load values at spans of 16 inches on center and 24 inches on center taken from referenced standard APA E30,APA Engineered Wood Construction Guide. Refer to referenced standard for allowable spans not listed in the table. |
For SI: 1 inch = 25.4 mm, 1 pound per square foot = 0.0479 kPa. a. The allowable total loads were determined using a dead load of 10 psf. If the dead load exceeds 10 psf, then the live load shall be reduced accordingly. b. Panels continuous over two or more spans with long dimension (strength axis) perpendicular to supports. Spans shall be limited to values shown because of possible effect of concentrated loads. c. Applies to panels 24 inches or wider. d. Lumber blocking, panel edge clips (one midway between each support, except two equally spaced between supports where span is 48 inches), tongue-and-groove panel edges, or other approved type of edge support. e. Includes Structural I panels in these grades. f. Uniform load deflection limitation:1/180 of span under live load plus dead load,1/240 of span under live load only. g. Maximum span 24 inches for15/32- and1/2-inch panels. h. Maximum span 24 inches where3/4-inch wood finish flooring is installed at right angles to joists. i. Maximum span 24 inches where 1.5 inches of lightweight concrete or approved cellular concrete is placed over the subfloor. j. Unsupported edges shall have tongue-and-groove joints or shall be supported with blocking unless minimum nominal1/4-inch-thick wood panel-type underlayment, fiber- cement underlayment with end and edge joints offset not less than 2 inches or 11/2 inches of lightweight concrete or approved cellular concrete is placed over the subfloor, or 3/4-inch wood finish flooring is installed at right angles to the supports. Fiber-cement underlayment shall comply with ASTM C1288 or ISO 8336 Category C. Allowable uniform live load at maximum span, based on deflection of1/360 of span, is 100 psf. k. Unsupported edges shall have tongue-and-groove joints or shall be supported by blocking unless nominal1/4-inch-thick wood panel-type underlayment, fiber-cement under- layment with end and edge joints offset not less than 2 inches or3/4-inch wood finish flooring is installed at right angles to the supports. Fiber-cement underlayment shall comply with ASTM C1288 or ISO 8336 Category C. Allowable uniform live load at maximum span, based on deflection of1/360 of span, is 100 psf, except panels with a span rating of 48 on center are limited to 65 psf total uniform load at maximum span. l. Allowable live load values at spans of 16 inches on center and 24 inches on center taken from referenced standard APA E30,APA Engineered Wood Construction Guide. Refer to referenced standard for allowable spans not listed in the table. |
For SI: 1 inch = 25.4 mm, 1 pound per square foot = 0.0479 kPa. a. The allowable total loads were determined using a dead load of 10 psf. If the dead load exceeds 10 psf, then the live load shall be reduced accordingly. b. Panels continuous over two or more spans with long dimension (strength axis) perpendicular to supports. Spans shall be limited to values shown because of possible effect of concentrated loads. c. Applies to panels 24 inches or wider. d. Lumber blocking, panel edge clips (one midway between each support, except two equally spaced between supports where span is 48 inches), tongue-and-groove panel edges, or other approved type of edge support. e. Includes Structural I panels in these grades. f. Uniform load deflection limitation:1/180 of span under live load plus dead load,1/240 of span under live load only. g. Maximum span 24 inches for15/32- and1/2-inch panels. h. Maximum span 24 inches where3/4-inch wood finish flooring is installed at right angles to joists. i. Maximum span 24 inches where 1.5 inches of lightweight concrete or approved cellular concrete is placed over the subfloor. j. Unsupported edges shall have tongue-and-groove joints or shall be supported with blocking unless minimum nominal1/4-inch-thick wood panel-type underlayment, fiber- cement underlayment with end and edge joints offset not less than 2 inches or 11/2 inches of lightweight concrete or approved cellular concrete is placed over the subfloor, or 3/4-inch wood finish flooring is installed at right angles to the supports. Fiber-cement underlayment shall comply with ASTM C1288 or ISO 8336 Category C. Allowable uniform live load at maximum span, based on deflection of1/360 of span, is 100 psf. k. Unsupported edges shall have tongue-and-groove joints or shall be supported by blocking unless nominal1/4-inch-thick wood panel-type underlayment, fiber-cement under- layment with end and edge joints offset not less than 2 inches or3/4-inch wood finish flooring is installed at right angles to the supports. Fiber-cement underlayment shall comply with ASTM C1288 or ISO 8336 Category C. Allowable uniform live load at maximum span, based on deflection of1/360 of span, is 100 psf, except panels with a span rating of 48 on center are limited to 65 psf total uniform load at maximum span. l. Allowable live load values at spans of 16 inches on center and 24 inches on center taken from referenced standard APA E30,APA Engineered Wood Construction Guide. Refer to referenced standard for allowable spans not listed in the table. |
For SI: 1 inch = 25.4 mm, 1 pound per square foot = 0.0479 kPa. a. The allowable total loads were determined using a dead load of 10 psf. If the dead load exceeds 10 psf, then the live load shall be reduced accordingly. b. Panels continuous over two or more spans with long dimension (strength axis) perpendicular to supports. Spans shall be limited to values shown because of possible effect of concentrated loads. c. Applies to panels 24 inches or wider. d. Lumber blocking, panel edge clips (one midway between each support, except two equally spaced between supports where span is 48 inches), tongue-and-groove panel edges, or other approved type of edge support. e. Includes Structural I panels in these grades. f. Uniform load deflection limitation:1/180 of span under live load plus dead load,1/240 of span under live load only. g. Maximum span 24 inches for15/32- and1/2-inch panels. h. Maximum span 24 inches where3/4-inch wood finish flooring is installed at right angles to joists. i. Maximum span 24 inches where 1.5 inches of lightweight concrete or approved cellular concrete is placed over the subfloor. j. Unsupported edges shall have tongue-and-groove joints or shall be supported with blocking unless minimum nominal1/4-inch-thick wood panel-type underlayment, fiber- cement underlayment with end and edge joints offset not less than 2 inches or 11/2 inches of lightweight concrete or approved cellular concrete is placed over the subfloor, or 3/4-inch wood finish flooring is installed at right angles to the supports. Fiber-cement underlayment shall comply with ASTM C1288 or ISO 8336 Category C. Allowable uniform live load at maximum span, based on deflection of1/360 of span, is 100 psf. k. Unsupported edges shall have tongue-and-groove joints or shall be supported by blocking unless nominal1/4-inch-thick wood panel-type underlayment, fiber-cement under- layment with end and edge joints offset not less than 2 inches or3/4-inch wood finish flooring is installed at right angles to the supports. Fiber-cement underlayment shall comply with ASTM C1288 or ISO 8336 Category C. Allowable uniform live load at maximum span, based on deflection of1/360 of span, is 100 psf, except panels with a span rating of 48 on center are limited to 65 psf total uniform load at maximum span. l. Allowable live load values at spans of 16 inches on center and 24 inches on center taken from referenced standard APA E30,APA Engineered Wood Construction Guide. Refer to referenced standard for allowable spans not listed in the table. |
| TABLE R503.2.1.1(2)—ALLOWABLE SPANS FOR SANDED PLYWOOD COMBINATION SUBFLOOR UNDERLAYMENTa | Col2 | Col3 | Col4 | |||||
| --- | --- | --- | --- | |||||
| ** IDENTIFICATION** | ** SPACING OF JOISTS** (inches) |
** SPACING OF JOISTS** (inches) |
** SPACING OF JOISTS** (inches) |
|||||
| ** IDENTIFICATION** | ** 16** | ** 20** | ** 24** | |||||
| Species groupb | — | — | — | |||||
| 1 | 1/2 | 5/8 | 3/4 | |||||
| 2, 3 | 5/8 | 3/4 | 7/8 | |||||
| 4 | 3/4 | 7/8 | 1 | |||||
| For SI: 1 inch = 25.4 mm, 1 pound per square foot = 0.0479 kPa. a. Plywood continuous over two or more spans and face grain perpendicular to supports. Unsupported edges shall be tongue-and-groove or blocked except where nominal1/4- inch-thick wood panel-type underlayment, fiber-cement underlayment or3/4-inch wood finish floor is used. Fiber-cement underlayment shall comply with ASTM C1288 or ISO 8336 Category C. Allowable uniform live load at maximum span based on deflection of1/360 of span is 100 psf. b. Applicable to all grades of sanded exterior-type plywood. |
For SI: 1 inch = 25.4 mm, 1 pound per square foot = 0.0479 kPa. a. Plywood continuous over two or more spans and face grain perpendicular to supports. Unsupported edges shall be tongue-and-groove or blocked except where nominal1/4- inch-thick wood panel-type underlayment, fiber-cement underlayment or3/4-inch wood finish floor is used. Fiber-cement underlayment shall comply with ASTM C1288 or ISO 8336 Category C. Allowable uniform live load at maximum span based on deflection of1/360 of span is 100 psf. b. Applicable to all grades of sanded exterior-type plywood. |
For SI: 1 inch = 25.4 mm, 1 pound per square foot = 0.0479 kPa. a. Plywood continuous over two or more spans and face grain perpendicular to supports. Unsupported edges shall be tongue-and-groove or blocked except where nominal1/4- inch-thick wood panel-type underlayment, fiber-cement underlayment or3/4-inch wood finish floor is used. Fiber-cement underlayment shall comply with ASTM C1288 or ISO 8336 Category C. Allowable uniform live load at maximum span based on deflection of1/360 of span is 100 psf. b. Applicable to all grades of sanded exterior-type plywood. |
For SI: 1 inch = 25.4 mm, 1 pound per square foot = 0.0479 kPa. a. Plywood continuous over two or more spans and face grain perpendicular to supports. Unsupported edges shall be tongue-and-groove or blocked except where nominal1/4- inch-thick wood panel-type underlayment, fiber-cement underlayment or3/4-inch wood finish floor is used. Fiber-cement underlayment shall comply with ASTM C1288 or ISO 8336 Category C. Allowable uniform live load at maximum span based on deflection of1/360 of span is 100 psf. b. Applicable to all grades of sanded exterior-type plywood. |
el 18 de julio de 2025 11:14 AM (CDT) BAJO ELLO.
PISOS
R503.2.2 Luz máxima permitida. La luz máxima permitida para paneles estructurales de madera usados como subsuelo o subsuelo combinado con capa de base será la establecida en la Tabla R503.2.1.1(1), o APA E30. La luz máxima para contrachapado lijado combinado como subsuelo con capa de base será la establecida en la Tabla R503.2.1.1(2).
R503.2.3 Instalación. Los paneles estructurales de madera usados como subsuelo o subsuelo combinado con capa de base deberán fijarse a la estructura de madera conforme a la Tabla R602.3(1) y deberán fijarse a la estructura de acero conformado en frío conforme a la Tabla R505.3.1(2).
R503.3 Tablero de partículas. ¶
R503.3 Tablero de partículas.
R503.3.1 Identificación y grado. El tablero de partículas deberá cumplir con ANSI A208.1 y deberá estar identificado mediante una marca de grado o un certificado de inspección emitido por una agencia aprobada.
R503.3.2 Subsuelo para pisos. El subsuelo para pisos de tablero de partículas deberá cumplir con el Tipo PBU y tener un espesor no menor de [1] / 4 pulgada (6.4 mm).
R503.3.3 Instalación. El subsuelo de tablero de partículas deberá instalarse de acuerdo con las recomendaciones del fabricante y fijarse a la estructura conforme a la Tabla R602.3(1).